Improved stone-sawing machine



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E L@ @u @EMU xiii NPETERs. Pnoraumoan gitana www .ABRAHAM ROTHWLL, OF BALTIMORE COUNTY, MARYLAND.

Letters Patent No. 86,102

, dated January 19, 1869.l

IMPROVED STONE-SAWIN G- MACHINE.

v'.he Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern Be it known that I, ABRAHAM RoTHwELL, of the county of Baltimore, and State of Maryland, have invented certain new and useful Improvements in Stone- Sawing Machine; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters oi' reference marked thereon, which form a partof this specification, and in which- Figure 1 represents a side elevation,

Figure 2, a top or plan view, and

Figure 3, a perspective view of feed-arrangement of my stone-sawing machine.

Similar letters of reference indicate corresponding parts in the several figures.

The object of my invention is to produce a machine, for cutting or sawing stone, which is capable of cutting two sides of an obelisk at one operation.

The nature of my invention consists in the employment of a stone bench, havinga number of guides ixed thereon, in such a manner that, when a block of stone or marble is placed on said stone bench, the guides, when properly adjusted, may form guides for the saws. y

It consists, further, in having the end-pieces of a saw-frame slotted, for the purpose oi allowing the saws to move from side to' side, said lateral motion being necessary, when the saws move in an oblique 'direction to thesaw-i'ame.

The clamps of the saws are, for that purpose, ex-

` tended through the slots of said end-pieces of sawframe, and mounted by rollers. Said rollers bear against the outside end of saw-frame..

It also consists of a combined carriage and suspenderarrangement, whereby one end ofthe carriage may be brought down, effecting an incline, more or less, for the purpose of giving a swing to the frame, and discharging water and sand from the saw-cut.

It further consists in the employment of screw-spindles in connection with tooth-gearing,pawl, ratchetwheel, and rock-shaft, for raising or lowering the' carriage-frame; and, lastly,

1t consists of a feed-device, hereinafter more fully setforth, whereby the cut of the saws may be regulated.

lo enable others skilled in the art to which my invention appertains, to make and use the same, I will now describe its construction and operation.

In the accompanying drawings- A represent a flaming, which may be constructed in any proper manner, to support the working-parts.

B B represent two longitudinal piece-S, which support the saw-trame C.

rlhe pieces B l5 are allowed to move freely up and down in grooves in the frame A, as seen at t', tig. 1.

Slides or ways S S are secured to the longitudinal pieces B B, to carry wheels or guides 4 4, or the waysl S S' may be made V-shaped, and corresponding projections fitting on the V-shaped pieces S S', and at tached to the saw-frame, may be employed. l

Slide-nuts b c are secured to the longitudinal pieces B B, and to the Suspenders d e, which receive screwspindles D D.

d e represent Suspenders provide-d with extensionjoints o o, said Suspenders connected with slide-nut c at h 7i. the other ends of Suspenders d e are secured at side of end-pieces of saw-frame C.

K is a rock-shaft, having its bearings in the frame A. lm. is a lever, which has one end secured to the rockshaft K, and slides up and clown thereon. The opposite 'end oi' the lever m is slotted, and a pin passed through said slot into the saw-frame C.

u n are holes, into which the pin may. be inserted to vary the feed of the saws.

.'On the upper end of the rock-shaft K lis a lever, l, secured thereon, ou the opposite end of which is a pin which works in a slot in the pawl o, which is supported tached to the frame A.

The pawl o moves the ratchet-wheel a, on the shaft W, as the saw-frame is ,moved backward and forward, which gives a rotary motion to the shaft NV and the pinion c, the latter gearing with the mitre-wheel V on the end of the saw-spindle D, turning the latter, whereby the saw-frame C and the longitudinal pieces B B are lowered.

X X represent pins or guides fixed on the stone bench or bed-plate E, to act as guidesfor the saws F F.

The pins or guides X X are provided with rollers which tit over and extend concentrically the whole length of said rollers. y

7 7 are holes for guides, to adapt the saws to the size of the Obelisk.

M represents a block of marble.

l() represents the connecting-rod to crank-shaft.

The red lines in lig. 2 indicate the position of clamps S when the saw-frame is moved back. y

The red lines iniig. 3 shows the carriage C lowered down, the arm 1n., on shaft K, following.

It will be observed that by operating the several Slide-nut c plays up auch down freely on screwby passing through a slot in the arm S, which is at-A nuts o o on the Suspenders d e, the inclination of.

the longitudinal pieces B B,nnd hence ofthe sawframe C, may be varied, 4the pieces B B being; hinged to the slide-nut b, '\v,l'1ichgives aswing to the freine, and facilitates the discharge of waiter and send from the saw-cnt.

It will also be observed that the slide-nuts o cproject overthe side pieces Aof' the saw-frame C. By this' arrangement :ill danger arising from the jumping of thesaAV-'ame is obvinted.

What I claim as my invention, and desire to secure by Letters Patent, is Y f vl. The saw-frame@ oblique saws F F, clamps 8 8, and fiiction-rollers 3 3, in combina-tion with the ncljustnble guide X X, as und for the purpose set forth.

2. The hinged longitudinal pieces B B, sliding in the 'nme A, in combination with the Suspenders d e, d e, and swivel-nuts o o, :is 'and for the purpose -set fortl1 3..The-sliden11t c, projecting over the saw-frame 0, to prevent the jumping of seid frame, as and for the purpose set forth.

4. The smv-'nme C, in combination with the ndjustnhle lever m/,inck-shzift K, lever I, pnwl o, ratchet.

u., pinons V V', :ind screw-spindles D D, to lower the Y saw-treme', substantially ns set forth.

In testimony that I claim the foregoing as my own, I aflix m'y signature, in presence of two witnesses.

` I ABRAHAM ROTHWELL. Witnesses;

G. ALEXANDER, J oHN A. ELLISK 

